fix: optimize Helm chart for landing page

- Remove duplicate application-credentials.yaml template
- Fix Reflex environment: production -> prod, staging -> dev
- Switch from Nginx to Traefik ingress controller
- Optimize resources for simple landing page (1 replica, minimal CPU/RAM)
- Disable autoscaling and PDB for landing page
- Add registry credentials for hub.peikarband.ir
- Clean up secrets configuration

helm/peikarband/values-staging.yaml

@@ -22,10 +22,11 @@ autoscaling:
 
 ingress:
   enabled: true
-  className: "nginx"
+  className: "traefik"
   annotations:
     cert-manager.io/cluster-issuer: "letsencrypt-staging"
-    nginx.ingress.kubernetes.io/ssl-redirect: "true"
+    traefik.ingress.kubernetes.io/router.entrypoints: "websecure"
+    traefik.ingress.kubernetes.io/router.tls: "true"
   hosts:
     - host: staging.peikarband.ir
       paths:
@@ -53,7 +54,7 @@ configMap:
   data:
     APP_NAME: "peikarband-staging"
     LOG_LEVEL: "debug"
-    ENVIRONMENT: "staging"
+    ENVIRONMENT: "dev"
 
 podDisruptionBudget:
   enabled: false